Liquid warmer



March 19, 1929. E. s. NEAL LIQUID WARMER INVENTOR Fi1e21.Deo. 17, 1927 Patented Mar. 19, 1929.

UNITED `STATES EARL S. NEAL, OF DALLAS, TEXAS.

LIQUID WARMER.

Application led December 17, 1927. Serial No. 240,819.

This invention relates to devices adapted for warming liquids, and refers more particularly to such a device which will be so constructed as to heat a liquid oi predetermined volume to a moderately warm (not hot) temperature, and thereafter maintain that temperature.

An object ofi this invention is to provide a device which will be chemical, acid, and alcohol proof, in short, a device which will not cor-rode because oit immersion in liquide in which one or more of the above mentioned agencies t'orm a part, nor will contaminate or aiiiect in any way the character or purity ot said agencies.

In laboratory tests lwhere extreme heatI or cold would curtail experimentation, this device will be found invaluable in maintaining an equable warm temperature. rlhis temperature is determined by two things, first, the size of the heating unit, and second, by the amount of liquid by voluu'ie, wherein the device .is immersed.

,fin advantage of this invention. is its simplicity ot construction, as well as the facility witl'l which access may be had to all parts et the device which might require adjustment or replacement 'from time t0 time.

The objects and advantages otthisinvention may be more clearly observed in the course oi the following description, taken in connection withthe annexed drawings, in which Figure l is a longitudinal sectional view ol' the device.

Figure 2 is a side elevation, partly in section, and Figure 3 is a detail view of the electrical Contact clamp members in engagement.

In the drawings, I provide a length oi aluminum tubing l, joined at one end to a hollow aluminum shell Q, either formed in one piece with the shell or swedged thereto, the other end of the tube being open.

In the shell I pack snuglyV a fibrous material, such as cork, rubber vor a similar material which is a nonwconductor of electricity, and I pass a pair ot electric wires 8 8 through the tubing and the fibrous material. To the ends of the wires in the device I secure a pair of clamps 4 4, (see Figure These clamps are set in the iibrous ma terial, which is faced by a thin sheet of asbestos l0. To another pair of clamps 5 5 I secure the respective ends of an asbestos or similarly covered wire conductor 6, the Wire being of size and lenO'th required to maintain a certain liquid volume at a specified temperature. It will be noted that the edges of the shell 2 are engaged by a cap 7 which is adapted to be forced over the end of the shell to render the compartment so formed, aire tight. At the end of the tubing I insert a closure member 9, through which the wires 8 8 are adapted to pass. The clamps t and 5 are so shaped that they will not easily come apart after engagement.

In use the device is capped and inserted in the liquid `and the connections made of the wires to a standard ll() .volt A. C. current. No liquid can enter the device, and the heating element will warm the shell and the cap, which in turn warms the water or liquid in which the device is immersed. The asbestos may be dispensed with as a cover for the heating element, the latter may be wound around a core et non-conducting material, but in any event the heating element must not come in contact with the metal Forming the walls ot the shell or the cap.

lWhat I claim is 1. In a liquid warmer, a cup shaped noncorrosive metallic body member or shell, a metal stem secured to the center of the cap and opening therein, a liller ot n0nconducting ibrous material adapted to conformably fit in the bottom oi the cup, a pair of metal clamps adapted to be seated in the fibrous material and in contact with the electrical circuit wires adapted to Ypass through the brous material and thestem, a pair of metal spring clamps adapted to be conformably engaged by the circuit clamps, an electrical resistance unit in connection to the spring clamps, means to insulate said resistance unit from the body member or shell, and a metal cap adapted to engage over the end ot the shell in an air tight relationship.

2. In a liquid warmer, a vcup shaped metallic body member, a metallic stem in connection thereto, a fibrous non-conductor in'I the cup shaped member, electrical current wires adapted to pass through the stem and the fibrous material to a pair ot contacts set in the brous material, a pair of clamps adapted to support a resistance unit, said clamps adapted to be connected in engagement to said contacts, means for insulating the resistance unit from the walls of the cup member and from a cap adapted to engage the cup member in airtight relationship.

In testimony whereof, I have signed my name to this speciication.

EARL s. NEAL. 

